The Apparent Brightness of a Star Is $1.0 \times 10 ^ { - 12 } \mathrm {~W} / \mathrm { m } ^ { 2 }$

question 25

Multiple Choice

The apparent brightness of a star is $1.0 \times 10 ^ { - 12 } \mathrm {~W} / \mathrm { m } ^ { 2 }$ and the peak wavelength in its light is 600 $\mathrm { nm }$ . Assuming it is the same size as our sun and that it radiates like an ideal blackbody, estimate its distance from us, in parsecs. The constant in Wien's law is $0.00290 \mathrm {~m} \cdot \mathrm { K }$ , and 1 parsec is equal to $3.09 \times 10 ^ { 16 } \mathrm {~m} . \left( R _ { \text {sun } } = 6.96 \times 108 \mathrm {~m} , \sigma = 5.67 \times 10 ^ { - 8 } \frac { \mathrm { W } } { \mathrm { m } ^ { 2 } \cdot \mathrm { K } ^ { 4 } } \right)$

• A) \(1.2 \mathrm { pc }\)
• B) \(120 \mathrm { pc }\)
• C) \(1200 \mathrm { pc }\)
• D) \(12 \mathrm { pc }\)

---

Definitions:

Debenture

Unsecured debt, usually with a maturity of ten years or more.

Line Of Credit

An arrangement between a financial institution and a customer that establishes a maximum loan balance that the borrower can access.

Carrying Costs

The cumulative expenses associated with maintaining inventory, which encompass storage fees, insurance premiums, taxes, the decrease in value over time, and the costs related to missed opportunities.

Shortage Costs

Costs incurred when demand exceeds supply, leading to inventory shortages, potentially including lost sales, backorder costs, and customer dissatisfaction.